code: def _identity(x):
      return x
  
imports: import warnings
  from copy import deepcopy
  from itertools import zip_longest
  from typing import Union, Optional, Callable, Any, Dict, List, Sequence, Mapping
  import numpy
  import torch
  import torch.utils.data
  from torch import Tensor
  from baal.active.dataset.base import SplittedDataset, Dataset
  from baal.utils.equality import deep_check
label_desc: Use image node_id 1 for calling a global function with example usage: _identity(x) and returns: x